AQA biology a level at University of Cambridge

Flashcards and summaries for AQA biology a level at the University of Cambridge

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Study with flashcards and summaries for the course AQA biology a level at the University of Cambridge

Exemplary flashcards for AQA biology a level at the University of Cambridge on StudySmarter:

What are microfibrils?

Exemplary flashcards for AQA biology a level at the University of Cambridge on StudySmarter:

What provides cellulose with strength?

Exemplary flashcards for AQA biology a level at the University of Cambridge on StudySmarter:

What is the test for non-reducing sugars?
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Exemplary flashcards for AQA biology a level at the University of Cambridge on StudySmarter:

Name three properties of starch

Exemplary flashcards for AQA biology a level at the University of Cambridge on StudySmarter:

What is the test for reducing sugars?

Exemplary flashcards for AQA biology a level at the University of Cambridge on StudySmarter:

Name three differences between starch and cellulose

Exemplary flashcards for AQA biology a level at the University of Cambridge on StudySmarter:

Where are introns found?
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Exemplary flashcards for AQA biology a level at the University of Cambridge on StudySmarter:

Compare the structure and properties of triglycerides and phospholipids 

Exemplary flashcards for AQA biology a level at the University of Cambridge on StudySmarter:

What are the 4 main roles of a lipid?

Exemplary flashcards for AQA biology a level at the University of Cambridge on StudySmarter:

What characteristics do all lipids share?

Exemplary flashcards for AQA biology a level at the University of Cambridge on StudySmarter:

What is a condensation reaction?
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Give three ways in which starch and cellulose are similar

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Exemplary flashcards for AQA biology a level at the University of Cambridge on StudySmarter:

AQA biology a level

What are microfibrils?
cellulose molecules that are grouped together 

AQA biology a level

What provides cellulose with strength?
hydrogen bonds that form  cross-linkages between adjacent chains

AQA biology a level

What is the test for non-reducing sugars?
1) heat the sample with dilute hydrochloride acid
2) neutralise it by adding sodium hydrocarbonate 
3) heat the sample with Benedict’s reagent 
A brick red precipitate indicates presence of reducing sugar

AQA biology a level

Name three properties of starch
insoluble: does not affect water potential 

compact: can be stored in small places

branched chains: enzymes can act simultaneously 

AQA biology a level

What is the test for reducing sugars?
Benedict’s test:
1) Add Benedict’s reagent 
2) heat the mixture in boiling water for 5 minutes
An orange-brown/brick red colour is formed if a reducing sugar is present 

AQA biology a level

Name three differences between starch and cellulose
Starch is made up of alpha glucose
Cellulose is made up of beta glucose

Starch can form branched/unbranched chains
Cellulose forms straight chains

Starch is storage molecule
Cellulose is a structural molecule

AQA biology a level

Where are introns found?
Between exons 

Within genes 

AQA biology a level

Compare the structure and properties of triglycerides and phospholipids 

Similarities:
Contain Ester bonds
Contain C H O

Differences:
triglycerides have three fatty acids whereas phospholipid has two
Triglycerides are hydrophobic whereas phospholipids have a hydrophilic and hydrophobic region

AQA biology a level

What are the 4 main roles of a lipid?
Source of energy: more than twice of carbohydrates energy

Waterproofing: insoluble in water

Insulation: slow conductors of heat, help retain body heat

Protection: stored around delicate organs

AQA biology a level

What characteristics do all lipids share?
Contain C H O

AQA biology a level

What is a condensation reaction?
Chemical process in which two molecules combine to form a more complex one with the removal of a simple substance (usually water)

AQA biology a level

Give three ways in which starch and cellulose are similar
both contain glucose

Both have 1-4 links 

Both contain glycosidic bonds  

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